id	summary	reporter	owner	description	type	status	priority	milestone	component	version	resolution	keywords	cc
18728	[patch WIP] Join overlapping  Areas is slow when combining many complex ways	GerdP	GerdP	"Load sample file join.osm.bz2 from #9911, select all elements and press Shift+J to ""Join overlapping Areas""
Note that it takes several seconds to join the areas, on my machine ~12 secs.

One reason for this is that class `DeleteCommand` calculates a Hashset for thounsands of objects within a loop instead of doing this once outside of the loop. This takes ~ 60% of the complete time."	enhancement	closed	normal	20.02	Core		fixed